How flat is the Universe?
Roos, Matts · Harun-or-Rashid, S. M.
Original · EN
In order to answer this question, we combine ten independent astrophysical constraints in the space of the density parameters Ωₘ of gravitating matter and ΩΛ of vacuum energy. We find that Ωₘ=0.31± 0.07, ΩΛ=0.63± 0.21, and thus Ωₘ + ΩΛ=0.94± 0.22. The total χ² is 4.1 for 8 degrees of freedom, testifying that the various systematic errors included are generous. We also determine Ωₘ in the exactly flat case. Five supplementary flat-case constraints can then be included in our fit, with the result Ωₘ=1-ΩΛ= 0.337±0.031. It follows that the age of the Universe is t₀ = 13.5± 1.3 (0.68/h) Gyr.
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